text: /*
   * Copyright (C) 2006 Hollis Blanchard <hollisb@us.ibm.com>, IBM Corporation
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
   */
  
  #ifndef _ASM_IA64_XEN_XENCOMM_H
  #define _ASM_IA64_XEN_XENCOMM_H
  
  #include <xen/xencomm.h>
  #include <asm/pgtable.h>
  
  /* Must be called before any hypercall.  */
  extern void xencomm_initialize(void);
  extern int xencomm_is_initialized(void);
  
  /* Check if virtual contiguity means physical contiguity
   * where the passed address is a pointer value in virtual address.
   * On ia64, identity mapping area in region 7 or the piece of region 5
   * that is mapped by itr[IA64_TR_KERNEL]/dtr[IA64_TR_KERNEL]
   */
  static inline int xencomm_is_phys_contiguous(unsigned long addr)
  {
  	return (PAGE_OFFSET <= addr &&
  		addr < (PAGE_OFFSET + (1UL << IA64_MAX_PHYS_BITS))) ||
  		(KERNEL_START <= addr &&
  		 addr < KERNEL_START + KERNEL_TR_PAGE_SIZE);
  }
  
  #endif /* _ASM_IA64_XEN_XENCOMM_H */
  